CCTV: Drunken parking crash

West Gate turned into carpark

Peak hour hell for commuters on the West Gate after crashes grind traffic to a halt on Tuesday afternoon.

Police were seeking to speak to the truck driver, believed to be driving a white prime mover with a red open trailer.

Victoria Police spokesman Kris Hamilton said Major Collision Investigation Unit detectives had now identified and spoken to the truck driver.

"The 45-year-old driver from Newport is assisting detectives with their investigation," Sergeant Hamilton said.

"As the investigation has progressed throughout the afternoon it has become clearer to detectives that the motorcyclist appears to have lost control and collided into the rear wheels of the large prime mover about 12.40pm."

He said the driver, upon hearing media reports on the incident, and a description of the truck involved, proactively made contact with police later in the day.

"The motorcyclist, a 41-year-old man from Altona North, remains in hospital in a very serious condition," Sergeant Hamilton said.

"The investigation is ongoing."

Anyone who witnessed the incident or with any information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.